CN102225425B - Leaching method for remedying heavy metal-polluted soil - Google Patents
Leaching method for remedying heavy metal-polluted soil Download PDFInfo
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- CN102225425B CN102225425B CN 201110110401 CN201110110401A CN102225425B CN 102225425 B CN102225425 B CN 102225425B CN 201110110401 CN201110110401 CN 201110110401 CN 201110110401 A CN201110110401 A CN 201110110401A CN 102225425 B CN102225425 B CN 102225425B
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Abstract
The method relates to a leaching method for remedying heavy metal-polluted soil. The method comprises the steps of: 1. taking p-sulfonatothiacalix [4] arene aqueous solution in a weight percentage of 0.3-0.5 as soil leacheate, regulating the pH value of the leacheate to be 10-11 by adopting sodium hydroxide; 2. putting the leacheate and heavy metal-polluted soil into a centrifugal pipe, putting the centrifugal pipe into a constant-temperature water bath vibrator, controlling the leaching temperature to be15-20 DEG C and vibration speed to 180turns/minitue, vibrating and leaching for 2-3 hours; 3. taking out and putting the centrifugal pipe into a centrifugal machine for centrifugal separation for 10 minutes at speed of 4,000turn/minutes, pouring out the leacheate, adding distillated water into the centrifugal pipe, vibrating for 30 minutes at 35 DEG C and at 180 turns/minute, and carrying out centrifugal separation for 10 minutes at speed of 4,000 turns/minute, thus finally obtaining clean soil. The method has the advantages of being good in leaching effect and capable of effectively avoiding leaching losses of meta elements such as K, Na, Ca, Mg and the like in soil.
Description
Technical field
The present invention relates to contaminated soil drip washing recovery technique, specifically, is a kind of ELUTION METHOD for restoration of soil polluted by heavy metal.
Background technology
Entered since 20th century, because industrial activity (such as mining and smelting) and agricultural production (sewage irrigation, mud, agricultural chemicals, chemical fertilizer application etc.) cause a large amount of soil in the whole world contaminated by heavy metals.According to statistics, current China is subjected to the farm land of heavy metal pollution to be about 2.5 * 10
7Hectare, wherein the severe contamination soil surpasses 7 * 10
5Hectare.The annual whole nation is because of heavy metal pollution underproduction grain 1.0 * 10
10Kilogram, contaminated by heavy metals grain also reaches 1.2 * 10 every year in addition
10Kilogram adds up to economic loss to reach at least 20,000,000,000 yuan.This shows that soil pollution by heavy metal has consisted of grave danger to China's food security and the common people are healthy; therefore the repairing and treating of heavy-metal contaminated soil has become the vital task of China's ecological environmental protection, and Heavy Metal Pollution Control also has been put into the major tasks during national 12.
At present, the restorative procedure of heavy-metal contaminated soil mainly comprises the methods such as physics reparation, chemistry reparation and biological restoration.Compare with other restorative procedures, chemical repair method has stable treatment effect, the advantage such as thorough, is particularly useful for the improvement of serious pollution soil, therefore development early, method is also relatively ripe.And the Soil leaching technology is as one of important technical of chemical repair method, owing to can fast pollutant be removed from soil, finish the improvement of high density pollution soil in short time, and control expense is relatively cheap, has now become the focus of contaminated soil fast repair technique research.The Soil leaching technology typically refers to by liquid or other fluids that can promote pollutant dissolving/migration in the soil environment comes the drip washing contaminated soil, and the pollutant desorption that adsorbs or be fixed on the soil particle is dissolved and the technology of removal.
The ELUTION METHOD that is used at present restoration of soil polluted by heavy metal mainly contains the methods such as the drip washing of acids leacheate, artificial chelating agent leacheate drip washing and the drip washing of surfactant leacheate.And all there are some defectives in these ELUTION METHOD, such as acids leacheate ELUTION METHOD and surfactant leacheate ELUTION METHOD to the heavy metal-polluted soil drip washing effect, although artificial chelating agent leacheate ELUTION METHOD has preferably drip washing effect to heavy metal-polluted soil, but it does not have metal selective, easily causes the leaching loss of the plant nutrient metalloid elements such as K in the soil, Na, Ca, Mg.
Summary of the invention
The objective of the invention is in order to provide a kind of drip washing effective, and can effectively avoid the ELUTION METHOD of the restoration of soil polluted by heavy metal of the plant nutrient metalloid element leaching losses such as K in the soil, Na, Ca, Mg.
A kind of ELUTION METHOD of restoration of soil polluted by heavy metal is as follows:
1. take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution of percentage by weight as 0.3～0.5 as leached soil solutions, adopting NaOH regulation and control leacheate pH value is 10～11.
2. leacheate and heavy-metal contaminated soil are placed centrifuge tube, the volume of Non-leaching liquid and soil and mass ratio are 10:1 ml/g, centrifuge tube is placed the water bath with thermostatic control oscillator, and it is 180 rev/mins with oscillation rate that the Non-leaching temperature is 15～20 ℃, vibration drip washing 2～3 hours.
3. the taking-up centrifuge tube places centrifuge, and centrifugation is 10 minutes under 4000 rev/mins of speed, topples over leacheate.Adding the distilled water with the same volume of leached soil solutions in the centrifuge tube, is that 35 ℃ and speed are 180 rev/mins of lower vibrations 30 minutes in temperature, and then centrifugation 10 minutes under 4000 rev/mins of speed finally obtains cleaning soil.
The present invention requires take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution as leached soil solutions, and regulation and control leached soil solutions pH value is 10～11, this active component mainly due to used leached soil solutions is sulfonation thia cup [4] aromatic hydrocarbons, its to heavy metal in conjunction with the removal ability owing under the molecule along phenolic hydroxyl group oxygen atom and the bridging sulphur atom complexing to heavy metal, experiment shows that this complexing increases along with the rising of pH value, drip washing removal effect to heavy metal also increases thereupon, but when pH reaches 12, the conformation of sulfonation thia cup [4] aromatic hydrocarbon molecule can change, formation is unfavorable for the molecular conformation of complexing, so that its drip washing removal effect to heavy metal significantly reduces, thus leached soil solutions pH value be controlled at 10～11 comparatively suitable.The temperature experiment result shows that high temperature and low temperature all are unfavorable for the drip washing of heavy metal is removed, thereby the Non-leaching temperature is 15～20 ℃.Leacheate consumption experimental result shows, drip washing removal effect to heavy metal progressively increases along with the rising of leacheate consumption, when being 10:1 ml/g, the volume of leacheate and contaminated soil and mass ratio substantially near balance, therefore control comparatively economical and efficient of this kind leacheate consumption.The drip washing dynamic experiment shows under 180 rev/mins of speed and vibrated 2～3 hours, to the wash-out removal effect of heavy metal substantially near constant.In addition, because soil surface can adsorb a small amount of leacheate active component after the drip washing, need to remove these active components that are adsorbed by the clear water flushing, experiment shows that the distilled water cleaning can reach removal effect substantially.
Beneficial effect of the present invention
1. the present invention can realize the efficient drip washing removal of heavy metal-polluted soil, and experiment shows that its drip washing clearance to the heavy metal contaminants such as Pb, Cd, Cu in the soil surpasses 95%.
2. the present invention can effectively avoid the leaching loss of K, Na, the plant nutrient metalloid elements such as Ca, Mg in the existing Soil leaching method.
The specific embodiment
Embodiment 1
A kind of ELUTION METHOD of restoration of soil polluted by heavy metal is:
1. take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution of percentage by weight as 0.3 as leached soil solutions, adopting NaOH regulation and control leacheate pH value is 11.
2. take by weighing 1 grammes per square metre metallic pollution soil and measure 10 milliliters of above-mentioned leached soil solutions in centrifuge tube, centrifuge tube is placed the water bath with thermostatic control oscillator, it is 180 rev/mins with oscillation rate that the Non-leaching temperature is 15 ℃, vibration drip washing 3 hours.
3. the taking-up centrifuge tube places centrifuge, and centrifugation is 10 minutes under 4000 rev/mins of speed, topples over leacheate.Adding 10 ml distilled waters in the centrifuge tube, is that 35 ℃ and speed are 180 rev/mins of lower vibrations 30 minutes in temperature, and then centrifugation 10 minutes under 4000 rev/mins of speed finally obtains cleaning soil.
Embodiment 2
A kind of ELUTION METHOD of restoration of soil polluted by heavy metal is:
1. take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution of percentage by weight as 0.3 as leached soil solutions, adopting NaOH regulation and control leacheate pH value is 10.
2. take by weighing 2 grammes per square metre metallic pollution soil and measure 20 milliliters of above-mentioned leached soil solutions in centrifuge tube, centrifuge tube is placed the water bath with thermostatic control oscillator, it is 180 rev/mins with oscillation rate that the Non-leaching temperature is 20 ℃, vibration drip washing 3 hours.
3. the taking-up centrifuge tube places centrifuge, and centrifugation is 10 minutes under 4000 rev/mins of speed, topples over leacheate.Adding 20 ml distilled waters in the centrifuge tube, is that 35 ℃ and speed are 180 rev/mins of lower vibrations 30 minutes in temperature, and then centrifugation 10 minutes under 4000 rev/mins of speed finally obtains cleaning soil.
Embodiment 3
A kind of ELUTION METHOD of restoration of soil polluted by heavy metal is:
1. take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution of percentage by weight as 0.5 as leached soil solutions, adopting NaOH regulation and control leacheate pH value is 11.
2. take by weighing 3 grammes per square metre metallic pollution soil and measure 30 milliliters of above-mentioned leached soil solutions in centrifuge tube, centrifuge tube is placed the water bath with thermostatic control oscillator, it is 180 rev/mins with oscillation rate that the Non-leaching temperature is 20 ℃, vibration drip washing 3 hours.
3. the taking-up centrifuge tube places centrifuge, and centrifugation is 10 minutes under 4000 rev/mins of speed, topples over leacheate.Adding 30 ml distilled waters in the centrifuge tube, is that 35 ℃ and speed are 180 rev/mins of lower vibrations 30 minutes in temperature, and then centrifugation 10 minutes under 4000 rev/mins of speed finally obtains cleaning soil.
Claims (1)
1. the ELUTION METHOD of a restoration of soil polluted by heavy metal, it is characterized in that: its method is: (1), take sulfonation thia cup [4] the aromatic hydrocarbons aqueous solution of percentage by weight as 0.3～0.5 as leached soil solutions, adopting NaOH regulation and control leacheate pH value is 10～11; (2), leacheate and heavy-metal contaminated soil are placed centrifuge tube, the volume of Non-leaching liquid and soil and mass ratio are 10:1 ml/g, centrifuge tube is placed the water bath with thermostatic control oscillator, it is 180 rev/mins with oscillation rate that the Non-leaching temperature is 15～20 ℃, vibration drip washing 2～3 hours; (3), take out centrifuge tube, place centrifuge, centrifugation is 10 minutes under 4000 rev/mins of speed, topple over leacheate, add the distilled water with the same volume of leached soil solutions in the centrifuge tube, be that 35 ℃ and speed are 180 rev/mins of lower vibrations 30 minutes in temperature, then centrifugation 10 minutes under 4000 rev/mins of speed finally obtains cleaning soil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110110401 CN102225425B (en) | 2011-04-29 | 2011-04-29 | Leaching method for remedying heavy metal-polluted soil |
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| CN 201110110401 CN102225425B (en) | 2011-04-29 | 2011-04-29 | Leaching method for remedying heavy metal-polluted soil |
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| CN102225425A CN102225425A (en) | 2011-10-26 |
| CN102225425B true CN102225425B (en) | 2013-01-30 |
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| CN102671933A (en) * | 2012-04-23 | 2012-09-19 | 沈阳大学 | Method for preparing eluent in remediation of heavy metal polluted soil |
| CN103056158A (en) * | 2012-12-05 | 2013-04-24 | 董长勋 | Chemical leaching method for repairing heavy metal contaminated soil |
| CN104438306A (en) * | 2013-09-20 | 2015-03-25 | 重庆文理学院 | Mechanical stirring type soil heavy metal elution apparatus |
| CN104249077B (en) * | 2014-10-10 | 2016-05-11 | 福建农林大学 | A kind of leaching repairing method of molybdenum polution soil |
| CN104437384A (en) * | 2014-11-05 | 2015-03-25 | 沈阳大学 | Compound modified bentonite |
| CN104492803B (en) * | 2014-12-16 | 2017-05-31 | 北京高能时代环境技术股份有限公司 | The cleaning method of restoration of soil polluted by heavy metal |
| CN109382400A (en) * | 2017-08-11 | 2019-02-26 | 上海环境节能工程股份有限公司 | The restorative procedure of contaminated site soil remediation |
| CN108273844A (en) * | 2018-01-23 | 2018-07-13 | 南京怡可帮生态环境科技有限公司 | Eluent production technology and application are eliminated in a kind of multifunction soil heavy metal pollution |
| CN108480378A (en) * | 2018-02-02 | 2018-09-04 | 南京怡可帮生态环境科技有限公司 | It is a kind of eliminate soil heavy metal combined pollution method and application |
| CN108500053A (en) * | 2018-02-02 | 2018-09-07 | 邸明春 | It is a kind of simultaneously and rapidly removal heavy metal pollution of soil method and application |
| CN108262352A (en) * | 2018-02-02 | 2018-07-10 | 南京怡可帮生态环境科技有限公司 | A kind of method for administering soil heavy metal combined pollution and application |
| CN108384552A (en) * | 2018-02-02 | 2018-08-10 | 南京怡可帮生态环境科技有限公司 | A kind of efficient heavy metal-polluted soil eluant, eluent production technology and application |
| CN108262345A (en) * | 2018-02-02 | 2018-07-10 | 南京怡可帮生态环境科技有限公司 | A kind of improvement heavy metal pollution of soil technology and application |
| CN108410473A (en) * | 2018-03-19 | 2018-08-17 | 吴洪生 | A kind of farmland soil heavy metals passivation agent and process for producing same and application |
| CN108480392A (en) * | 2018-03-19 | 2018-09-04 | 南京怡可帮生态环境科技有限公司 | It is a kind of to control agricultural land soil various heavy active passivation agent and process for producing same and application simultaneously |
| CN108822861A (en) * | 2018-03-23 | 2018-11-16 | 南京怡可帮生态环境科技有限公司 | A kind of synchronous fixation passivation stabilizing farmland soil Compound Heavy Metals technology and application |
| CN108822860A (en) * | 2018-03-23 | 2018-11-16 | 吴洪生 | A kind of agricultural land soil Compound Heavy Metals in-situ passivation technology and application |
| CN109454102A (en) * | 2019-01-04 | 2019-03-12 | 北京高能时代环境技术股份有限公司 | A kind of elution of chromium slag contaminated soil-stabilisation combined remediation method |
Citations (1)
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| CN101301658A (en) * | 2008-06-16 | 2008-11-12 | 沈阳大学 | Eluent for repairing polluted soil and preparation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101301658A (en) * | 2008-06-16 | 2008-11-12 | 沈阳大学 | Eluent for repairing polluted soil and preparation thereof |
Non-Patent Citations (5)
| Title |
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| ".《Environm ental Progress》.2005,第39-48页. |
| KoI,LeeCH, Lee KP,et al."Remediation of soil contaminated with arsenic, zinc, and nickel by pilot􀀁 |
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